Solute Analyse of Directional Solidification Microstructure in a Binary Alloy

In this paper, the directional solidification microstructure of Bridgman system was simulated using phase-field method, and different calculated results were obtained with four pulling velocities. Transverse solute shows "U" shape profiles. With the pulling velocity (v(p)) increasing, the span of "U" figures decreases and the deepness of "U" figures decreases too. When the pulling velocity reaches 3.00 cm/s, the "U" figures disappear. With the supersaturation and the growing velocity increases, the directional microstructure changes from thin columnar crystals into much thinner columnar crystals. Transverse solute has a very little fluctuation around the initial concentration and the solute trapping phenomenon takes place.